<template>
	<div class="todo-container">
    <div class="todo-wrap">
			<!-- 头部 -->
      <Header @add-todo="addTodo"/>
			<!-- 列表 -->
      <List :todos="todos" :deleteTodo="deleteTodo" :checkTodo="checkTodo"/>
      <!-- 底部 -->
			<Footer 
				v-show="todos.length" 
				:todos="todos" 
				:checkAll="checkAll" 
				:clearAllDone="clearAllDone"
			/>
    </div>
  </div>
</template>

<script>
	import Header from './components/Header'
	import List from './components/List'
	import Footer from './components/Footer'

	export default {
		name:'App',
		components:{Header,List,Footer},
		data(){
			return {
				todos:JSON.parse(localStorage.getItem('yiduishi')) || []
			}
		},
		methods:{
			//添加一个todo
			addTodo(todoObj){
				this.todos.unshift(todoObj)
			},
			//删除一个todo
			deleteTodo(id){
				this.todos = this.todos.filter((todoObj)=>{
					return todoObj.id !== id
				})
			},
			//勾选一个todo
			checkTodo(id,done){
				this.todos.forEach((todoObj)=>{
					if(todoObj.id === id) todoObj.done = done
				})
			},
			//全选 or 全不选
			checkAll(done){
				this.todos.forEach((todoObj)=>{
					todoObj.done = done
				})
			},
			//清除所有已完成
			clearAllDone(){
				this.todos = this.todos.filter(todoObj => !todoObj.done)
			}

		},
		watch:{
			todos:{
				deep:true,
				handler(value){
					localStorage.setItem('yiduishi',JSON.stringify(value))
				}
			}
		}
	}
</script>

<style>
	/*base*/
	body {
		background: #fff;
	}
	.btn {
		display: inline-block;
		padding: 4px 12px;
		margin-bottom: 0;
		font-size: 14px;
		line-height: 20px;
		text-align: center;
		vertical-align: middle;
		cursor: pointer;
		box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
		border-radius: 4px;
	}
	.btn-danger {
		color: #fff;
		background-color: #da4f49;
		border: 1px solid #bd362f;
	}
	.btn-danger:hover {
		color: #fff;
		background-color: #bd362f;
	}
	.btn:focus {
		outline: none;
	}
	.todo-container {
		width: 600px;
		margin: 0 auto;
	}
	.todo-container .todo-wrap {
		padding: 10px;
		border: 1px solid #ddd;
		border-radius: 5px;
	}
</style>